Which structures act as wires of a telephone in the body?

RRB Nsg. Superintendent 21 July 2019 (shift 1st)

Applied Anatomy

Easy

Appeared in: RRB Nsg. Superintendent 21 July 2019 (shift 1st)

Explanation

Nerves are the fundamental units of the nervous system that act as the body's communication network.
They are composed of neurons, which have long fibers called axons that transmit electrochemical signals, known as nerve impulses or action potentials.
This function is directly analogous to telephone wires, which transmit electrical signals to carry information from one point to another.
The nervous system allows for rapid communication between the central nervous system (brain and spinal cord) and peripheral parts of the body, controlling sensation, thought, and movement.

Option A: Muscles are effector tissues that contract to produce force and movement. They receive signals from nerves but do not primarily transmit them throughout the body.
Option C: Arteries are blood vessels that carry oxygenated blood away from the heart to the tissues. Their function is transport of fluid and nutrients, not information signals.
Option D: Veins are blood vessels that carry deoxygenated blood from the tissues back to the heart. Like arteries, their role is fluid transport, not signal transmission.

Visual 1: Diagram - A labeled diagram of a neuron, highlighting the cell body, dendrites, and the long axon, captioned 'The Body's Electrical Wire'.
Visual 2: Infographic - A comparative chart showing the nervous system next to a telecommunication network, with the brain as the central server, spinal cord as the main cable, and peripheral nerves as the individual wires to houses.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Physiological analogies for major body systems as background academic context rather than a clinical decision trigger.
Understanding the 'wiring' function of nerves is crucial for recognizing symptoms of neurological disorders. Damage to nerves (neuropathy) can disrupt signal transmission, leading to numbness, tingling, muscle weakness, or pain.
Conditions like Multiple Sclerosis (MS) involve damage to the myelin sheath, the insulating layer around nerves, which impairs the speed and efficiency of signal transmission, similar to how damaged insulation on a wire can cause a short circuit.
What if the question asked which structure acts as the body's 'central pump'?: The answer would be the heart, which pumps blood through the circulatory system (arteries and veins).

How to Approach the Question

First, analyze the analogy presented in the question stem: 'wires of a telephone'.
Identify the primary function of telephone wires, which is to transmit electrical signals for communication over distances.
Next, evaluate each of the given options based on its primary physiological function in the body.
Compare the function of each option to the function of telephone wires.
Nerves transmit electrochemical signals (nerve impulses). This is a direct match.
Muscles contract for movement. Arteries and veins transport blood. These functions do not match the analogy of signal transmission.

Concept Tested & Keywords

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